The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2004
Filed:
May. 29, 2003
Uwe Hammer, Hemmingen, DE;
Bjoern Schuetz, Besigheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
A device for controlling at least one gas-changing valve ( ) of an internal combustion engine includes a valve adjuster ( ) with an adjusting piston ( ) limiting two pressure chamber ( ). The lower pressure chamber ( ) is permanently acted upon by fluid pressure and the upper pressure chamber ( ) can be interchangeably pressurized or depressurized with the fluid pressure. The braking of the adjusting piston ( ) before reaching its upper end position affecting the closing position of the gas-changing valve, the return ( ) of the upper pressure chamber ( ) is divided into at least two axially spaced run-off openings ( ), of which the lower run-off opening ( ) can be closed by the adjusting piston ( ) and the upper run-off opening ( ) is connected with the lower run-off opening ( ) via a throttle opening ( ) controllable in an opening cross section. For a temperature-independent braking action of the throttle opening ( ), a temperature-controlled, pressure-regulating valve ( ) is provided for adjusting the control pressure on the throttle opening ( ).